CN201725623U

CN201725623U - Submarine electric power cable

Info

Publication number: CN201725623U
Application number: CN201020143070XU
Authority: CN
Inventors: 屠亦军; 李捍平; 何旭涛; 郑新龙; 张秀峰; 胡文侃; 闫循平; 李程
Original assignee: Zhoushan Power Authority Zhejiang Electric Power Corp
Current assignee: Zhoushan Power Authority Zhejiang Electric Power Corp
Priority date: 2010-03-29
Filing date: 2010-03-29
Publication date: 2011-01-26
Anticipated expiration: 2020-03-29

Abstract

The utility model relates to a submarine electric power cable. The submarine electric power cable comprises a conductor (1), a semi-conducting layer (2), a heat insulation layer (3), a buffer layer (4), a lead sleeve (5), an inner protective sleeve layer (6), an armor layer (7) and an armor outer protective layer (8) which are arranged from inside to outside. The utility model is characterized in that the inner protective sleeve layer (6) is a mixed layer formed by the semi-conducting layer and the insulation layer through end-to-end serial connection in two forms. Compared with the prior art, the utility model adopts the scheme that the armor inner protective sleeve layer is the mixed layer formed by the semi-conducting layer and the insulation layer through end-to-end serial connection in two forms. The design has the advantages that the underground part and the ground part of the submarine electric power cable have different inner protective sleeve layer structures, the underground part is an anticorrosive semi-conducting layer, so the induced potential problem can be effectively solved, the circular current problem can be further solved, and the ground part is an insulation layer with the same structure as the electric power cable in common use, so the crossed interconnection can be realized, and further the goals of consumption reduction and current carrying capacity improvement can be reached.

Description

A kind of sea electric power cable

Technical field

The utility model relates to a kind of submarine cable technical field that is used for, and especially refers to a kind of power cable that is used for the seabed.

Background technology

At present, submarine cable generally can produce induced potential on metallic sheath, so needing to adopt the method for ground connection eliminates, make it safe operation, but can produce circulation loss again, the ampacity of cable reduces greatly, can not make full use of the current capacity of cable conductor, has caused the wasting of resources to a certain extent.The structure of existing submarine cable is generally all added the layer of polyethylene sheath in the metallic sheath outside, makes it the anticorrosive coat as submarine cable, and has insulation property.In order to eliminate the electrical potential difference between submarine cable metallic sheath and the armour, common practices is, every about 500 meters with the pe sheath strip off, one end of one or more braiding copper cash is welded on the metallic sheath, the other end contacts with wire armoring by the opening of pe sheath, thereby eliminates the electrical potential difference between metallic sheath and the armour.But the cable that adopts this method to lay, its metallic sheath discharge is inhomogeneous, and the opening part on the pe sheath is also thrown off easily, makes the cable water inlet easily, and antiseptic effect can't satisfy.

Existing a kind of patent No. is 200720108676.8 and is called that the Chinese utility model patent of " a kind of seabed cross-linked power cable " discloses a kind of structure, its structure comprises core, armouring inner covering, armour and the armouring outer jacket that is provided with from inside to outside, characteristics are that armour is made up of around the nonmagnetic metal silk of arranging many uniform ring, and the nonmagnetic metal silk is outside equipped with the plastics anticorrosive coat; Advantage is to substitute the zinc-coated wire sheathed structure with nonmagnetic metal silk sheathed structure both to have exempted serious eddy current, the magnetic hysteresis loss of taking the zinc-coated wire sheathed structure and producing, it is nearly 30% to make it allow ampacity to exceed than the permission ampacity of zinc-coated wire armoured cable, has guaranteed the tensile strength of seabed cross-linked power cable again; Be outside equipped with the plastics anticorrosive coat at the nonmagnetic metal silk, make nonmagnetic metal silk armoured cable place seawater for a long time and can not be corroded.But its shortcoming is it has done improvement to armour, and has above-mentioned shortcoming equally, also the tensile strength of conductor is not made improvements, and this cable amount of copper consuming is big, cost is higher so it is made, so its structure awaits to improve.

Summary of the invention

Technical problem to be solved in the utility model is to provide the sea electric power cable that a kind of loss is few and current-carrying is high at above-mentioned prior art present situation.

The utility model solves the problems of the technologies described above the technical scheme that is adopted: this sea electric power cable; comprise the conductor, semi-conductive layer, insulating barrier, resilient coating, plumbous cover, inner restrictive coating, armour and the armouring external protection that are provided with from the inside to the outside, it is characterized in that: the mixed layer that described inner restrictive coating is in series from beginning to end by semi-conductive layer and two kinds of forms of insulating barrier.

As improvement, described insulation inner restrictive coating may be selected to be polyethylene layer, and described semiconductive inner restrictive coating can be preferably the semiconductive polyethylene layer.

Improve, described conductor can be selected the mixing core be made up of steel wire lead and aluminum conductor again, and described steel wire lead is positioned at the center of conductor, and steel wire lead and aluminum conductor are the formed conductor of steel reinforced aluminium conductor structure.

Improve, described steel reinforced aluminium conductor structure is meant: some strands of steel wire leads are positioned at the center again, and some strands of aluminum conductors are outside the steel wire lead and be twisted into the steel reinforced aluminium conductor conductor mutually.

Improve again; described armour is made up of many galvanized steel wire ropes; described galvanized steel wire rope is positioned at the structure that same periphery distributes and the protective layer that forms with cross section; certainly; described armour also can be made up of many galvanized steel wire ropes and some Al-alloy metal silks, and described galvanized steel wire rope and some Al-alloy metal silks are to be spaced and to be positioned at the structure that same periphery distributes and the protective layer that forms with cross section.

Improve, described armouring external protection can be the pitch outer wrapping layer of polypropylene rope as inner reinforcement again.

Compared with prior art, the utility model adopts the mixed layer that the armouring inner restrictive coating is in series from beginning to end by semi-conductive layer and two kinds of forms of insulating barrier.The advantage of this design be sea electric power cable under water the part with land part by different inner restrictive coating structures, underwater portion is the corrosion-resistant semi-conductive layer, can effectively solve the problem of induced potential like this, and then solve circulation problem; And land part is a layer insulating, and is identical with the structure of common electric power cable, can realize cross interconnectedly like this, and then reaches and reduces the wastage, and improves the purpose of ampacity.

Description of drawings

Fig. 1 is the structure cutaway view of the utility model embodiment.

Embodiment

Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.

As shown in Figure 1; the sea electric power cable of present embodiment; comprise the conductor 1, semi-conductive layer 2, insulating barrier 3, resilient coating 4, plumbous cover 5, inner restrictive coating 6, armour 7 and the armouring external protection 8 that are provided with from the inside to the outside, the mixed layer that described inner restrictive coating 6 is in series from beginning to end by semi-conductive layer and two kinds of forms of insulating barrier.Above-mentioned insulation inner restrictive coating is chosen as polyethylene layer, and the semiconductive inner restrictive coating is chosen as the semiconductive polyethylene layer.The mixing core that conductor 1 is made up of steel wire lead and aluminum conductor, this steel wire lead is positioned at the center of conductor 1, and steel wire lead and aluminum conductor are the formed conductor 1 of steel reinforced aluminium conductor structure.So-called steel reinforced aluminium conductor structure is meant: some strands of steel wire leads are positioned at the center, and some strands of aluminum conductors are outside the steel wire lead and be twisted into the steel reinforced aluminium conductor conductor mutually.Armour 7 is made up of many galvanized steel wire ropes 71, and described galvanized steel wire rope 71 is positioned at the structure that same periphery distributes and the protective layer that forms with cross section.Certainly; armour 7 also can be made up of many galvanized steel wire ropes 71 and some Al-alloy metal silks; described galvanized steel wire rope 71 and some Al-alloy metal silks are to be spaced and to be positioned at the structure that same periphery distributes and the protective layer that forms specifically can be decided by designing requirement with cross section.Armouring external protection 8 is the pitch outer wrapping layer of polypropylene rope as inner reinforcement.

Below the utility model is further specified.

As shown in Figure 1; a kind of sea electric power cable; be divided under water and land two parts; underwater portion comprises conductor 1, semi-conductive layer 2, insulating barrier 3, resilient coating 4, plumbous cover 5, semi-conductive layer inner restrictive coating 6, armour 7, the armouring external protection 8 that is provided with from inside to outside, and land part comprises conductor 1, semi-conductive layer 2, insulating barrier 3, resilient coating 4, plumbous cover 5, insulating barrier inner restrictive coating 6, armour 7, the armouring external protection 8 that is provided with from inside to outside.

Claims

1. sea electric power cable; comprise the conductor (1), semi-conductive layer (2), insulating barrier (3), resilient coating (4), plumbous cover (5), inner restrictive coating (6), armour (7) and the armouring external protection (8) that are provided with from the inside to the outside, it is characterized in that: the mixed layer that described inner restrictive coating (6) is in series from beginning to end by two kinds of forms of semiconductive inner restrictive coating and insulation inner restrictive coating.

2. power cable according to claim 1 is characterized in that: described insulation inner restrictive coating is a polyethylene layer.

3. power cable according to claim 1 is characterized in that: described semiconductive inner restrictive coating is the semiconductive polyethylene layer.

4. according to claim 1 or 2 or 3 described power cables, it is characterized in that: the mixing core that described conductor (1) is made up of steel wire lead and aluminum conductor, described steel wire lead is positioned at the center of conductor (1), and steel wire lead and aluminum conductor are the formed conductor of steel reinforced aluminium conductor structure (1).

5. power cable according to claim 4 is characterized in that: described armour (7) is made up of many galvanized steel wire ropes (71), and described galvanized steel wire rope (71) is positioned at the structure that same periphery distributes and the protective layer that forms with cross section.

6. power cable according to claim 4; it is characterized in that: described armour (7) is made up of many galvanized steel wire ropes (71) and some Al-alloy metal silks, and described galvanized steel wire rope (71) and some Al-alloy metal silks are to be spaced and to be positioned at the structure of same periphery distribution and the protective layer that forms with cross section.

7. power cable according to claim 4 is characterized in that: described steel reinforced aluminium conductor structure is meant: some strands of steel wire leads are positioned at the center, and some strands of aluminum conductors are outside the steel wire lead and be twisted into the steel reinforced aluminium conductor conductor mutually.

8. according to claim 1 or 2 or 3 described power cables, it is characterized in that: described armouring external protection (8) is the pitch outer wrapping layer of polypropylene rope as inner reinforcement.